London, 2017: When Aurelia Leclaire inherits an opulent Paris apartment, she is shocked to discover her grandmother’s hidden secrets - including a treasure trove of famous art and couture gowns. One obscure painting leads her to Gabriel Seymour, a highly respected art restorer with his own mysterious past. Together they attempt to uncover the truths concealed within the apartment’s walls.

London, 1880. When accounts clerk Ernest Stibbins approaches the World's End investigation bureau with wild claims that his wife Albertina has been warned by her spirit guides that someone is out to harm her, the bureau's owner Lily Raynor and her new employee Felix Wilbraham are sceptical. How are the two private enquiry agents supposed to investigate threats from beyond the grave? But after she attends a seance at the Stibbins family home, Lily comes to realize that Albertina is in terrible danger. And soon, so is Lily herself....

It's 1935. Rita Feuerstahl comes to the university in Krakow intent on enjoying her freedom. But life has other things in store - marriage, a love affair, a child, all in the shadows of the oncoming war. When the war arrives, Rita is armed with a secret so enormous that it could cost the Allies everything, even as it gives her the will to live. She must find a way both to keep her secret and to survive amid the chaos of Europe at war.

Being a gay man in 1827 is not only frowned upon in England, but punishable by death. Magistrate Simon Stockley would know. He’s convicted men in his courtroom and sentenced them himself. Every time, it leaves a vile taste in his mouth because Simon is no different than the men whose lives he claims.

Tabby has a peculiar gift: She can communicate with the recently departed. It makes her special, but it also makes her dangerous. As an orphaned child, she fled with her sister, Alice, from their charlatan aunt Bellefonte, who wanted only to exploit Tabby's gift so she could profit from the recent craze for seances. Now a young woman and tragically separated from Alice, Tabby works with her adopted father, Eli, the kind caretaker of a large Boston cemetery.

January 1888: Dr. John H. Watson has returned to 221b Baker Street, just weeks after a personal tragedy has left him bereaved and bereft. Feeling like a broken man, his plans and dreams lying in ruin, he slowly tries to make his way forward, with the help of Sherlock Holmes and Mrs. Hudson. Unexpectedly, he finds himself standing in the path of a madman—who suddenly and irrationally blames Watson for his apparent defeat.

July 1940. As the Battle of Britain begins, the women of the Air Transport Auxiliary carry out the dangerous task of ferrying warplanes to RAF airbases. But for the ATA detachment sent to the base at Scotney, it’s not only in the skies that they’re a target—it seems a killer is stalking them on the ground. On the day pilot Lizzie Hayes arrives in the quiet village, one of her new comrades is found murdered. One of the few women in Britain with a psychology PhD, Lizzie thinks she can use her skills to help identify the killer, but DI Jonathan Kember isn’t convinced.

London, 1885. Amelie Hampton is a hopeless romantic, which makes her the perfect columnist to answer lonely heart letters in The Marriage Gazette. When Amelie plays matchmaker with two anonymous lonely hearts, she also decides to secretly observe the couple’s blind date. To her surprise, the man who appears for the rendezvous is Harold Radcliffe - a grieving widower and a member of Amelie’s book club.

Singapore, 1910 - Desperate for a fresh start, Harriet Gordon finds herself living with her brother, a reverend and headmaster of a school for boys, in Singapore at the height of colonial rule. Hoping to gain some financial independence, she advertises her services as a personal secretary. It is unfortunate that she should discover her first client, Sir Oswald Newbold - explorer, mine magnate, and president of the exclusive Explorers and Geographers Club - dead with a knife in his throat.

The scrap of folded paper weighed heavy in Saskia’s pocket. The Nazi guards were patrolling the streets in ever-increasing numbers and every time she passed one on her bicycle she felt herself tense. The note she held told a story of unbelievable courage. The Nazis wanted the prisoners to give up hope inside the camp but Saskia was smuggling letters to them from their loved ones, giving them a reason to survive.

Captain Sam Wyndham, former Scotland Yard detective, is a new arrival to Calcutta. Desperately seeking a fresh start after his experiences during the Great War, Wyndham has been recruited to head up a new post in the police force. He is immediately overwhelmed by the heady vibrancy of the tropical city, but with barely a moment to acclimatize or to deal with the ghosts that still haunt him, Wyndham is caught up in a murder investigation that threatens to destabilize a city already teetering on the brink of political insurgency.

As Hitler’s bombs rain down on a battered and beleaguered Britain, Ruby Shadwell is dealt the most devastating blow - her entire family lost during the Coventry Blitz. Alone and with the city in chaos, Ruby is determined to survive this war and rebuild her life. And a chance encounter with street urchin Tommy gives Ruby just the chance she needs.... Because Tommy brings with him Canadian Sergeant Jean-Paul Clayton. Jean-Paul is drawn to Ruby and wants to help her, but Ruby cannot bear another loss.

London, 1890. The city is ruled by the nobility and the Watch, or so it seems. When an underground organization pursues the alchemical formula to create a soul, bodies begin to pile up, and important figures begin to go missing. Masked men turn the gears of fate, pushing London into a new era where artificial life is only the beginning. Arhyen is the self-declared finest thief in London. The mission was simple. Steal a journal from Fairfax Breckinridge, one of the greatest alchemists of the time. He hadn't expected to find Fairfax himself, with a dagger in his back.

February 1942: Terrifying reports of the Wehrmacht’s advance across the Soviet Union spread like wildfire, striking new fear into the already oppressed German families living there. Harri Pfeiffer, now sixteen, is summoned to the forced labour camp in Chelyabinsk. Three years later, with the war finally over, Yvo Scholz arrives in Chelyabinsk, desperate for news of her brother. Still uncertain of the fate of her father, it takes all Yvo’s unshakeable courage to build a new life for herself. When their paths intersect, Harri and Yvo find a connection they never thought possible.

England: 1944. When psychologist Maddie Gresham is sent a mysterious message telling her to report to Trent Park mansion, she wonders how she will be helping the war effort from a stately home. Having signed the official secrets act, she soon finds captured Nazi generals are being detained at the house. Bugged with listening devices in every room, it’s up to Maddie to gain the Nazis’ trust and coax them into giving up information. When Max Weitzler, a Jewish refugee, also arrives at Trent Park with the same mission, Maddie finds herself trapped in a dangerous game of chess.